import {z} from 'zod'

export type ProposeMappingRequest = {format?: ('csv' | 'json' | 'xml' | 'camt053') | undefined, hints?: {[key: string]: string} | undefined, sample: string};

export type CreateApiV1ImportsContextsContextIdSourcesSourceIdMappingProposalArgs = {contextId: string, sourceId: string, body: ProposeMappingRequest};

export type CreateApiV1ImportsContextsContextIdSourcesSourceIdMappingProposalOptions = {baseUrl?: string | undefined, BearerAuth?: string | undefined, fetch?: typeof fetch | undefined};

export const dialectResponse = z.object({dateStyle: z.string(), decimalStyle: z.string(), delimiter: z.string(), encoding: z.string()});

export const fieldProposalResponse = z.object({canonicalKey: z.string(), confidence: z.number().gte(0).lte(1), rationale: z.string(), sourceColumn: z.string()});

export const mappingProposalResponse = z.object({dialect: dialectResponse.optional(), fields: z.array(fieldProposalResponse).nullable(), mapping: z.record(z.string(), z.unknown()).optional()});

export const validateResponse = async <Output>(
  schema: {
    readonly '~standard': {
      readonly validate: (value: unknown) => ({ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }) | Promise<{ readonly value: Output; readonly issues?: undefined } | { readonly issues: ReadonlyArray<{ readonly message: string; readonly path?: ReadonlyArray<PropertyKey | { readonly key: PropertyKey }> | undefined }> }>
    }
  },
  value: unknown
): Promise<Output> => {
  const result = await schema['~standard'].validate(value)

  if (result.issues !== undefined) {
    const detail = result.issues
      .map(({ message, path }) =>
        path?.length
          ? `${path.map((segment) => String(typeof segment === 'object' ? segment.key : segment)).join('.')}: ${message}`
          : message
      )
      .join('; ')

    throw new Error(`Response does not match the schema: ${detail}`, { cause: { issues: result.issues } })
  }

  return result.value
};

/**
 * Propose a config-only field-map/dialect mapping for a source sample
 * 
 * POST /v1/imports/contexts/{contextId}/sources/{sourceId}/mapping-proposal
 */
export const createApiV1ImportsContextsContextIdSourcesSourceIdMappingProposal = async (args: CreateApiV1ImportsContextsContextIdSourcesSourceIdMappingProposalArgs, options?: CreateApiV1ImportsContextsContextIdSourcesSourceIdMappingProposalOptions) => {
const {baseUrl = "https://identity.sandbox.lerian.net", fetch: fetchFn = fetch, BearerAuth} = options ?? {}

const query = new URLSearchParams()
const headers = new Headers()
headers.set('content-type', "application/json")
headers.set('accept', "application/json")

if (BearerAuth !== undefined) headers.set('authorization', `Bearer ${BearerAuth}`)

const url = `${baseUrl.replace(/\/+$/, '')}/v1/imports/contexts/${encodeURIComponent(String(args.contextId))}/sources/${encodeURIComponent(String(args.sourceId))}/mapping-proposal${query.size > 0 ? `?${query}` : ''}`

const res = await fetchFn(url, {method: "POST", headers, body: JSON.stringify(args.body)})

if (!res.ok) throw new Error(`Request failed with status ${res.status}`, {cause: {status: res.status, body: await res.text()}})

return validateResponse(mappingProposalResponse, await res.json())
};